Switching method and device for island model and grid-connected model of microgrid

An island mode and mode switching technology, which is applied in the field of power transmission and distribution, can solve problems such as the unreliable operation of microgrids, and achieve the effects of improving power supply reliability, ensuring reliable operation, and smooth and seamless switching

Inactive Publication Date: 2018-01-19
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for switching between island mode and grid-connected mode of a microgrid, which solves the problem that the microgrid cannot operate reliably when switching between different operating modes in the existing microgrid

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  • Switching method and device for island model and grid-connected model of microgrid
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  • Switching method and device for island model and grid-connected model of microgrid

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Embodiment Construction

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] Energy shortage, climate change and environmental pollution are major issues facing mankind in the 21st century. At present, more than 80% of the world's energy consumption relies on fossil energy such as coal, oil, and natural resources. A large number of greenhouse gas emissions have brought about a series of problems such as climate change and environmental pollution, and seriously threatened the sustainable development of human society. The developm...

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Abstract

The embodiment of the invention provides a switching method and device for an island model and a grid-connected model of a microgrid, relates to the technical field of power transmission and distribution, and solves the problem that the system cannot reliably run during switching of the microgrid among different working modes. The switching method comprises the steps of receiving a grid-connectedinstruction; synchronizing voltage phase angles in the microgrid and a large power grid according to the grid-connected instruction, and inputting a first target angle value to grid connection; and switching the microgrid to the grid-connected mode from the island mode by a changeover switch when the voltage amplitude in the microgrid and the large power grid are synchronized, and resetting a PI controller in the grid-connected mode. The switching method is used for switching running modes of the microgrid.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a method and device for switching between an island mode and a grid-connected mode of a microgrid. Background technique [0002] Microgrid is a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads, monitoring and protection devices, which can achieve more environmentally friendly, efficient and reliable distributed power generation. The microgrid can run in parallel with the external large power grid, or run independently (that is, island operation), so as to supply power to local loads and avoid frequent interference to the large power grid, so it has higher power supply security and reliability. [0003] In different operating modes of the microgrid (grid-connected mode and island mode), the control mode of the inverter is very different. When the operat...

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Application Information

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IPC IPC(8): H02J3/44
Inventor 曹琬钰朱喆许树楷李岩
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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